I'd hesitate to use them on anything of mine. doesn't look easy to remove and reinsert and what about stranded wires? On my house, I've had 2 of my 115v duplex outlets loose connection on those press in connections. Not my original work and they did last decades but still a pain to find.

These are actually pretty good substitutes for "wire nuts," with two caveats: 1) they take up more volume; and, 2) they can't be easily disconnected, i.e., you should consider them "permanent," unlike wire nuts that can be unscrewed. I use them mostly in running cable through a series (actually it's a parallel circuit) of recessed ceiling lamps. The bulkier nature of these connectors is actually compensated by the fact that you don't need to run a "pigtail."

The only question I have regards the "ampacity" of the copper clips in this device. It may not be beefy enough to handle high loads...but I don't worry about that for lighting circuits.

Something like them came with some outlet strips I installed, they were a huge hassle, but nothing else would fit inside. Next time I'll put a box at the end of the strip so I can use good old-fashioned wire nuts that can be disconnected!